Cutting head and bit.



F. M. ROSS.

CUTTING HEAD AND BIT.

APPLIOATION FILED 001221, 1909.

Patented Nov. 22, 1910.

2 SHEETS-SHEET 1.

P. M. ROS$.

CUTTING HEAD AND BIT.

APPLICATION FILED 0GT.21, 1909.

Patented Nov. 22, 1910.

2 SHEET8SHEET 2.

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FREDERICK M. ROSS, OF NEWPORT, KENTUCKY, ASSIGNOR TO ACME HIGH-SPEEDKNIFE AND MANUFACTURING CODTPANY, OF OAKLEY, OHIO, A CORPORATION OFOHIO.

CUTTING 'HEAD AND BIT.

Specification of Letters Patent.

Application filed October 21, 1909.

Patented Nov. 22, 1910.

Serial No. 523,764.

To all whom it may concern:

Be it known that I, FnnDEnIoirM. Ross, a citizen of the United States ofAmerica, and resident of Newport, Campbell county, State of Kentucky,have invented certain new and useful Improvements in Cutting Heads andBits, of which the following is a specification. 7

This invention relates to cutting heads for wood working and similarmachines and particularly to means for mounting the bits or knives.

In carrying out my invention, I employ high-speed steel knives, and suchsteel can only be obtained in certain widths. The steel is rolled to thedesired shapes and can not, because of its characteristics, be stamped.

An object of my invention, therefore, is to provide simple and effectivemeans for mounting high-speed steel knives, which adapts itself to thenecessary construction of the knives.

A further object is to produce a cutting head, in which means areemployed for keeping the bit the same width, irrespective of thedecrease in width of the knives, due to grinding away in the operationof sharpening.

A further object is to produce means whereby the cutting edges of theknives are always maintained at the same distance from the mountingbolts, so that the leverage on the bolts is maintained constant, as thepositions of the knives are varied to take up the decrease in Widthresulting from the sharp ening operation.

A further object is to produce means for mounting the knives on thecutting head, so that they may be shifted longitudinally of the head.

These and other objects I attain in an apparatus embodying the featuresherein described, and illustrated in the drawings accompanying thisapplication and forming a part thereof.

In the drawings, Figure 1 is a perspective view of an assembled cuttinghead for a planer or similar machine, with the knives elevation of aclamp-plate in connection with a knife, means for securing the knife tothe plate, and a gage in position for adjusting the knife on the plate.Fig. 5 is a sectional view taken along the line 55 of Fig. 2. Fig. 6 isa sectional view taken along the line 66 of Fig. 3.

The apparatus consists of a cutting head, clamp-plates to which knivesare adjustably secured, and which are adapted to be secured to thecutting head in such a way, that the knives are held rigidly inposition.

Referring to the drawings: A cutting head, 7, is provided with fourmounting faces, 8,011 each of which a knife, 9, is mounted by means of aclamp-plate, 10.

Each knife is adjnstably mounted upon its corresponding clamp plateprior to mounting the plate on the head, 7, and each plate may besecured to the head by means of T-head bolts, 11, the heads of whichengage under-cut channels, 12, formed in the head, 7, and extendinglongitudinally across each mounting face, 8. Each clamp-plate, 10, isprovided near each end with a slot, 14, which extends transversely ofthe plate to about its center line and terminates in a circular recess,15, formed on the outer face of the plate. The slots, 14;, are adaptedto receive the shanks of the bolts, 11, and the recesses, 15, areadapted to receive washers, 16, )rovided for the bolts, so that eachplate always occupies the same relative position when mounted on thehead, 7.

The knives, 9, are made of high speed steel and, consequently arelimited to a shape which can be rolled. Each knife is provided at itsrear edge with a longitudinally extending groove, 17, so located as toform a clove-tailed tongue, 18, on the rear edge of the knife. Adjustingclamps, 19, are provided for securing the knives to their correspondingclamp plates. Each clamp, 19, is provided at one end with a slot, 21,which is adapted to engage the tongue, 18, and to secure the clamp tothe knife. Each clamp is located in a channel, 22, which extends acrossthe inner face of the clamp-plate. The rear end of each adjusting clampis provided with a tapered hole, 23, which is adapted to receive atapered screw, 24. Each clamp, 19, is split from its rear end to a pointbeyond the hole, 23, so that it will be spread to grip the walls of thechannel, 22, when the tapered screw, 24, is screwed into the hole, 23.Each clamp-plate is provided with two channels, 22, and consequentlyeach knife is secured to its corresponding clampplate by means of twoclamps, 19. With this arrangement, the knives can be moved laterally ofthe clamp-plate to adjust the position of their cutting edges.

A gage plate, 25, is mounted on the inner face of each clamp-plate,10,at itsrear edge. The rear face of each plate, 25, is carefully planedand is employed as an adjusting face for the knife edge. A gage bar, 26,is provided for use in adjusting the knife edge. The gage bar fits overthe adjusting face of the plate, 25, and the cutting edge of the knife,and when the knife is in position, it may be secured in place by meansof the adjusting clamps, 19. With this arrangement, the knife edges willalways be maintained at the same distance from the adjusting faces ofthe plates, 25, irrespective of the width of the knives, and the widthof the cutting bit will always be the same. Moreover the distance fromthe cutting edges of the knives to the bolts, 11, will always be thesame and the leverage on the bolts will not vary, as the knives decreasein width, due to the operation of sharpening.

After the knives are properly adjusted and secured to the clamp-plates,the clampplates are firmly secured to the cutting head, 7. Then theclamp-plates are in place on the cutting head, each knife is firmlygripped between its corresponding clamp-plate and the cutting head andheld firmly in place.

If during the operation of the cutting head the knives should come incontact with a nail or other substance which would nick their cuttingedges, the knives may be shifted longitudinally, so that the nicks inthe separate knives are not in alinement. This may be done by looseningthe clamp-plates and shifting the knives through the under-cut slots,21, of the adjusting clamps, without destroying the adjustment of theknives. When the clamp-plates are again firmly secured to the cuttinghead, the knives are ready for operation without any other adjustment.

What I claim is:

1. A cutting head, a clamp-plate, a knife, means for positively mountingsaid knife on said plate whereby it is capable of a purely longitudinalmotion along the plate, and means for mounting said plate and said knifeon said head.

2. A cutting head, a knife, a clamp plate, an adjusting clamp mounted onsaid clamp plate and engaging said knife, and means for securing saidclamp plate and said knife to said head.

3. A cutting head, a clamp plate provided with a transversely extendingchannel, an imperforate knife, means mounted in and movable along saidchannel and engaging said knife for mounting said knife on said plate,and means for securing said plate and said knife to said head.

4:- A cutting head, a clamp-plate, provided with a transverselyextending channel, a knife, means mounted in said channel and engagaingsaid knife for securing said knife to said plate and for permitting itto move longitudinally of said plate without changing itstransverseadjustment, and means for rigidly mounting said plate and saidknife on said head.

5. A cutting head, a knife, a clamp plate for securing said knife tosaid head, bolts for securing said plate to said head, and clamps seatedin the plate and having a sliding connection with the knife and adaptedto permit a lateral adjustment of the knife, without changing itstransverse adjustment.

6. A cutting head, a clamp-plate provided with a transversely extendingchannel, an imperforate knife, an adjusting clamp engaging said knifeand movable longitudinally there along, means for expanding said clampto grip the walls of said channel to secure said knife on said plate,and means for mounting said plate on said head.

7. A cutting head, a clamp-plate, an im perforate knife, adjustingclamps for securing said knife to said plate and means for securing saidplate to said head.

8. A cutting head, a clamp plate provided with a transversely extendingchannel, an imperforate knife, an adjusting clamp engaging said knife,means for locking said clamp at different positions along said channelto secure said knife to said plate, and

means for mounting said plate on said head.

9. A cutting head, a knife, a clamp plate for securing said knife tosaid head, bolts for securing said plate to said head, adjusting clampsseated in transversely extending channels in said plate and having asliding connection with said knife, and means for expanding said clampsto positively lock them to said plate.

FREDERICK M. ROSS.

Witnesses:

WVALTER F. MURRAY, THOMAS C. BROWN.

